[PARISC] Handle wrapping in expand_upwards()
Function expand_upwards() did not guarded against wrapping around to address 0. This fixes the adjtimex02 testcase from the Linux Test Project on a 32bit PARISC kernel. [expand_upwards is only used on parisc and ia64; it looks like it does the right thing on both. --kyle] Signed-off-by: Helge Deller <deller@gmx.de> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
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